The device I want to play to is the iPod itself where the program is installed. There is no setting available or needed for this.
In any event, since the app closes as soon as I start it there is no access to the settings.
The problem is simple - when I start the app it immediately closes. There seems to be a bug in the app to cause this.
The previous versions all worked fine so the problem has to be with this latest version. I've rebooted my server (my computer - Windows 10) but that didn't solve the problem. Incidentally the MC Panel works fine.